AI Article Synopsis
- The experiment utilized anaerobic fermentation to treat kitchen waste and produce hydrogen, revealing a shift from mixed acid to ethanol fermentation after 22 days.
- The highest hydrogen production efficiency achieved was 4.77 LH(2)/(L reactor d) under specific operational conditions, including an organic loading rate of 32-50 kg COD/(m³ d) and a temperature around 35°C.
- An artificial neural network model indicated that the most significant factors affecting hydrogen yield were organic loading rate, pH, oxidation reduction potential, and alkalinity, with organic loading rate having the greatest influence; the production cost of hydrogen was found to be lower than that of water electrolysis.
Article Abstract
In order to treat the kitchen wastes and produce hydrogen, anaerobic fermentation technology was used in this experiment. The results showed that the fermentation type changed from mixed acid fermentation to ethanol fermentation in a continuous stirred tank reactor (CSTR) 22 days after start-up. The maximum efficiency of hydrogen bio-production in the CSTR was 4.77 LH(2)/(L reactor d) under the following conditions: organic loading rate (OLR) of 32-50 kg COD/(m(3) d), oxidation reduction potential (ORP) of -450 to -400 mV, influent pH value of 5.0-6.0, effluent pH value of 4.0-4.5, influent alkalinity of 300-600 mg/l, temperature of 35 +/- 1 degrees C and hydraulic retention time (HRT) of 7 h. An artificial neural network (ANN) model was established, and each parameter influencing the performance of the reactor was compared using the method of partitioning connection weights (PCW). The results showed that OLR, pH, ORP and alkalinity could influence the fermentation characteristics and hydrogen yield of the anaerobic activated sludge; with an influence hierarchy: OLR > pH values > ORP > alkalinity. An economic analysis showed that the cost of producing hydrogen in this experiment was less than the cost of electrolysis of water.
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| http://dx.doi.org/10.1007/s10529-009-0024-3 | DOI Listing |
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